Use buffered channel for signal notification

Refer to https://pkg.go.dev/os/signal#Notify for more details.

Signed-off-by: Martin Hickey <martin.hickey@ie.ibm.com>

.github/workflows/build-pr.yml

@@ -21,8 +21,8 @@ jobs:
           sudo mv golangci-lint-$GOLANGCI_LINT_VERSION-linux-amd64/golangci-lint /usr/local/bin/golangci-lint
           rm -rf golangci-lint-$GOLANGCI_LINT_VERSION-linux-amd64*
         env:
-          GOLANGCI_LINT_VERSION: '1.36.0'
+          GOLANGCI_LINT_VERSION: '1.43.0'
-          GOLANGCI_LINT_SHA256: '9b8856b3a1c9bfbcf3a06b78e94611763b79abd9751c245246787cd3bf0e78a5'
+          GOLANGCI_LINT_SHA256: 'f3515cebec926257da703ba0a2b169e4a322c11dc31a8b4656b50a43e48877f4'
       - name: Test style
         run: make test-style
       - name: Run unit tests

cmd/helm/install.go

@@ -253,8 +253,10 @@ func runInstall(args []string, client *action.Install, valueOpts *values.Options
 	ctx := context.Background()
 	ctx, cancel := context.WithCancel(ctx)
 
-	// Handle SIGTERM
+	// Set up channel on which to send signal notifications.
-	cSignal := make(chan os.Signal)
+	// We must use a buffered channel or risk missing the signal
+	// if we're not ready to receive when the signal is sent.
+	cSignal := make(chan os.Signal, 2)
 	signal.Notify(cSignal, os.Interrupt, syscall.SIGTERM)
 	go func() {
 		<-cSignal

cmd/helm/root_unix.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 /*

cmd/helm/root_unix_test.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 /*

cmd/helm/upgrade.go

@@ -186,8 +186,10 @@ func newUpgradeCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 			ctx := context.Background()
 			ctx, cancel := context.WithCancel(ctx)
 
-			// Handle SIGTERM
+			// Set up channel on which to send signal notifications.
-			cSignal := make(chan os.Signal)
+			// We must use a buffered channel or risk missing the signal
+			// if we're not ready to receive when the signal is sent.
+			cSignal := make(chan os.Signal, 2)
 			signal.Notify(cSignal, os.Interrupt, syscall.SIGTERM)
 			go func() {
 				<-cSignal

pkg/helmpath/home_unix_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !windows
 // +build !windows
 
 package helmpath

pkg/helmpath/lazypath_darwin.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build darwin
 // +build darwin
 
 package helmpath

pkg/helmpath/lazypath_darwin_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build darwin
 // +build darwin
 
 package helmpath

pkg/helmpath/lazypath_unix.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !windows && !darwin
 // +build !windows,!darwin
 
 package helmpath

pkg/helmpath/lazypath_unix_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !windows && !darwin
 // +build !windows,!darwin
 
 package helmpath